Former Manchester United striker Bebe has refused to rule out a return to Old Trafford.
The Portuguese forward joined United for £8m from Vitória de Guimarães in 2010 but failed to impress during his time in England.
The 25-year-old made just two league appearances for the club and was subsequently loaned out to several sides before being sold to Benfica in 2014.
He then failed to break into the first team at the Estadio da Luz and has since been loaned out to La Liga's Rayo Vallecano.
However, Bebe believes he still has an opportunity to play for a "big club" in Europe, despite his poor goalscoring record.
"I've never thought about that [returning to Man United], but nothing is impossible," he told Portuguese newspaper Publico.
"If I score 10 goals in La Liga then for sure, I'll be able to sign for a big club. If I score 10 goals here at Rayo Vallecano I'm going to have many big teams chasing me again next year."